BCOR and extranodal nasal NK/T cell lymphoma: In order to more precisely estimate the frequency of BCOR mutation in lymphoma patients, we examined genomic DNA from 47 NK/T cell lymphoma patient samples and detected two types of nonsense mutations (E197X and W289X) along with one type of missense mutation (K607E) (Fig. 1a, b and Figure S1, Additional file 2).